Ramp android-marshmallow-arm64-rel to 100% luci.

Bug: 731985
Change-Id: I63a1602ce7ab7aea00683df8afdd41d1df4a9e59
Reviewed-on: https://chromium-review.googlesource.com/1069870Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560881}

infra/config/branch/cq.cfg

@@ -79,7 +79,7 @@ verifiers {
         equivalent_to {
           bucket: "luci.chromium.try"
           builder: "android-marshmallow-arm64-rel"
-          percentage: 10
+          percentage: 100
         }
       }
       builders {